US7275021B2 - Measuring method and arrangement - Google Patents

Measuring method and arrangement Download PDF

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Publication number
US7275021B2
US7275021B2 US11/284,891 US28489105A US7275021B2 US 7275021 B2 US7275021 B2 US 7275021B2 US 28489105 A US28489105 A US 28489105A US 7275021 B2 US7275021 B2 US 7275021B2
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Prior art keywords
summed
data
power converter
component
summing
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US20060116831A1 (en
Inventor
Risto Komulainen
Jorma Vesti
Stefan Strandberg
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Vacon Oy
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Vacon Oy
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Assigned to VACON OYJ reassignment VACON OYJ ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STRANDBERG, STEFAN, VESTI, JORMA, KOMULAINEN, RISTO
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter

Definitions

  • the present invention relates to a method and arrangement for the processing of quantities, such as current, voltage, power or moment, measured or calculated by a power converter apparatus consisting of power converter units, e.g. for generating a summed or average quantity.
  • quantities such as current, voltage, power or moment
  • a power converter apparatus consisting of power converter units, e.g. for generating a summed or average quantity.
  • the invention relates e.g. to an arrangement where a high-power frequency converter apparatus consists of a plurality of parallel-connected lower-power frequency converter or inverter units.
  • a high-power frequency converter apparatus consists of a plurality of parallel-connected lower-power frequency converter or inverter units.
  • the component current of each frequency converter is measured, and these currents are then summed e.g. to regulate the load, such as an alternating-current motor, connected to the frequency converter apparatus.
  • the object of the present invention is to overcome the drawbacks of prior art and to create a solution for reducing the delay in the measurement of the current of parallel-connected power converter units.
  • the current data are transmitted between the power units and the control unit by using a digital serial communication method as follows:
  • the summing of the current data and further transmission of the summed current are started one bit at a time as soon as the LSBs of the component currents have been received, in such manner that
  • the data transfer delay caused by the summing can be minimized, and its minimum duration in the solution of the invention is only as long as the time it takes to compute the sum of the bits, in practice a few clock cycles.
  • the dynamic summing in reverse order according to this method requires that all the component currents be of the same sign, which is achieved e.g. by adding to all the component currents 50% of their measuring range.
  • FIG. 1 presents a frequency converter apparatus consisting of a number of frequency converter units and a motor connected to it,
  • FIG. 1 a presents another frequency converter apparatus consisting of a number of frequency converter units and a motor connected to it
  • FIG. 2 illustrates the scaling of the output phase current
  • FIG. 3 illustrates summing of the current and further transmission of the sum data.
  • FIG. 1 presents a three-phase voltage-controlled high-power frequency converter apparatus and its load, a three-phase motor M, which may be e.g. a cage induction motor.
  • the frequency converter apparatus feeds a variable-frequency three-phase alternating voltage into the motor M to control is speed of rotation.
  • the frequency converter apparatus contains three parallel-connected frequency converter units FC 1 -FC 3 , each of which comprises a mains bridge REC, a direct-voltage intermediate circuit Udc and a load bridge INU.
  • the frequency converter units are connected to a common three-phase alternating voltage network UL via inductor units L 1 -L 3 .
  • the apparatus comprises a common digital control unit CU for controlling the power semiconductor switches, e.g. IGBTs of the load bridge of the frequency converter and for regulating the motor M, among other things, and a summing unit SC, which functions as a transmission unit between the frequency converter units and the control unit.
  • Each frequency converter unit contains a measuring unit CT 1 , CT 2 , CT 3 for measuring the outgoing phase current, and the current measurement data obtained from the measuring units is passed in digital form to the summing unit SC and further as current measurement data summed from the component currents to the control unit CU.
  • the extra delay required by the summing of the current can be minimized as follows:

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Paper (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US11/284,891 2004-11-26 2005-11-23 Measuring method and arrangement Active US7275021B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20041521 2004-11-26
FI20041521A FI117145B (fi) 2004-11-26 2004-11-26 Mittausmenetelmä ja -järjestely

Publications (2)

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US20060116831A1 US20060116831A1 (en) 2006-06-01
US7275021B2 true US7275021B2 (en) 2007-09-25

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US11/284,891 Active US7275021B2 (en) 2004-11-26 2005-11-23 Measuring method and arrangement

Country Status (6)

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US (1) US7275021B2 (fi)
EP (1) EP1662651B1 (fi)
AT (1) ATE411639T1 (fi)
DE (1) DE602005010372D1 (fi)
DK (1) DK1662651T3 (fi)
FI (1) FI117145B (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102565673A (zh) * 2011-12-18 2012-07-11 西安航天精密机电研究所 基于fpga的高可靠脉冲计数测试系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9672185B2 (en) 2013-09-27 2017-06-06 International Business Machines Corporation Method and system for enumerating digital circuits in a system-on-a-chip (SOC)
JP6546293B2 (ja) * 2016-01-15 2019-07-17 東芝三菱電機産業システム株式会社 制御システム

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950773A (ja) 1982-09-17 1984-03-23 Fanuc Ltd 位相出力のチエツク回路
EP0128492A2 (en) 1983-06-03 1984-12-19 Mitsubishi Denki Kabushiki Kaisha Method of measuring the D.C. level of the output of an A.C.-to-D.C. power converter
JPS6110984A (ja) 1984-06-27 1986-01-18 Fuji Electric Co Ltd 電流ベクトル位相検出装置
JPH03109699A (ja) 1989-09-22 1991-05-09 Hitachi Ltd 計測制御システム
US5877950A (en) 1996-09-09 1999-03-02 Schneider Electric Sa Device for measuring currents in a converter
US6021057A (en) 1996-05-21 2000-02-01 Siemens Aktiengesellschaft Inverter system
FR2830138A1 (fr) 2001-09-24 2003-03-28 Schneider Toshiba Inverter Systeme de mesure des courants moteur dans un onduleur de variateur de vitesse
US20030151932A1 (en) 2002-02-13 2003-08-14 Semikron Elektronik Gmbh Control circuit for current converter valves
US20040199267A1 (en) 2003-02-27 2004-10-07 Siemens Aktiengesellschaft Data transmission system for connecting a controller with drives
US20060034326A1 (en) * 2004-06-04 2006-02-16 Anderson Jon J High data rate interface apparatus and method
US20060279970A1 (en) * 2002-11-14 2006-12-14 Kent Kernahan Switching power converter controller

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950773A (ja) 1982-09-17 1984-03-23 Fanuc Ltd 位相出力のチエツク回路
EP0128492A2 (en) 1983-06-03 1984-12-19 Mitsubishi Denki Kabushiki Kaisha Method of measuring the D.C. level of the output of an A.C.-to-D.C. power converter
JPS6110984A (ja) 1984-06-27 1986-01-18 Fuji Electric Co Ltd 電流ベクトル位相検出装置
JPH03109699A (ja) 1989-09-22 1991-05-09 Hitachi Ltd 計測制御システム
US6021057A (en) 1996-05-21 2000-02-01 Siemens Aktiengesellschaft Inverter system
US5877950A (en) 1996-09-09 1999-03-02 Schneider Electric Sa Device for measuring currents in a converter
FR2830138A1 (fr) 2001-09-24 2003-03-28 Schneider Toshiba Inverter Systeme de mesure des courants moteur dans un onduleur de variateur de vitesse
US20030151932A1 (en) 2002-02-13 2003-08-14 Semikron Elektronik Gmbh Control circuit for current converter valves
US20060279970A1 (en) * 2002-11-14 2006-12-14 Kent Kernahan Switching power converter controller
US20040199267A1 (en) 2003-02-27 2004-10-07 Siemens Aktiengesellschaft Data transmission system for connecting a controller with drives
US20060034326A1 (en) * 2004-06-04 2006-02-16 Anderson Jon J High data rate interface apparatus and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102565673A (zh) * 2011-12-18 2012-07-11 西安航天精密机电研究所 基于fpga的高可靠脉冲计数测试系统
CN102565673B (zh) * 2011-12-18 2014-05-28 西安航天精密机电研究所 基于fpga的高可靠脉冲计数测试系统

Also Published As

Publication number Publication date
FI117145B (fi) 2006-06-30
FI20041521A (fi) 2006-05-27
EP1662651A3 (en) 2006-11-02
FI20041521A0 (fi) 2004-11-26
DK1662651T3 (da) 2009-02-02
DE602005010372D1 (de) 2008-11-27
EP1662651A2 (en) 2006-05-31
EP1662651B1 (en) 2008-10-15
US20060116831A1 (en) 2006-06-01
ATE411639T1 (de) 2008-10-15

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